A bidirectional pulling device for polyimide film

Abstract

The present invention belongs to the technical field of polyimide film, specifically a bidirectional pulling device for polyimide film, including a bottom plate and a circular plate, and also includes: a pulling component for fully stretching the polyimide film, and the pulling component is arranged on the top of the circular plate; a pulling component for unfolding the pulling component, and a plurality of pulling components are installed in a circular arrangement on the top of the circular plate; a rotating component for rotating the circular plate, and the rotating component is installed on the bottom plate; a transmission component that can utilize the rotational force of the rotating component to operate the pulling component, and the pulling component includes: a bracket, and a plurality of brackets are installed in a circular arrangement on the top of the circular plate. The present invention has the function of fully stretching the polyimide film by arranging the pulling component, and can greatly reduce the unstretched position by fully stretching the polyimide film, thereby improving the stretching quality to a certain extent.

Description

Technical Field

[0001] The invention relates to the technical field of polyimide films, in particular to a polyimide film bidirectional pulling device. Background Art

[0002] The polyamic acid solution is cast into film, stretched, and imidized at high temperature. The film is yellow and transparent, with a relative density of 1.39 to 1.45. It has outstanding high temperature resistance, radiation resistance, chemical corrosion resistance and electrical insulation properties, and can be used for a long time in air at 250 to 280°C.

[0003] The existing patent CN218701230U discloses a bidirectional pulling mechanism for a polyimide film, although the patent can solve the following problems:

[0004] 1. When the conventional bidirectional pulling mechanism for the polyimide film is used, the pulling degree has certain limitations, so that the pulled polyimide film cannot be tightened as required, which is very inconvenient to use;

[0005] 2. When the conventional bidirectional pulling mechanism for the polyimide film is used, the pulling mechanism will contact the polyimide film. As the pulling time increases, the surface of the polyimide film will be worn, which is troublesome to use.

[0006] However, in the patent, after the polyimide film is biaxially stretched, the four corners of the polyimide film are not stretched, and the polyimide film cannot be fully stretched, which affects the stretching quality. Therefore, a polyimide film biaxial stretching device is invented. Summary of the invention

[0007] In view of the above problems and / or the problems existing in the existing polyimide film bidirectional pulling device, the present invention is proposed.

[0008] Therefore, the object of the present invention is to provide a polyimide film bidirectional pulling device that can solve the above-mentioned existing problems.

[0009] To solve the above technical problems, according to one aspect of the present invention, the present invention provides the following technical solutions:

[0010] A polyimide film bidirectional pulling device, comprising a bottom plate and a circular plate, and further comprising:

[0011] A pulling assembly for fully stretching the polyimide film, wherein the pulling assembly is arranged on the top of the circular plate;

[0012] A pulling assembly is used to expand the pulling assembly, and a plurality of pulling assemblies are installed in a circular arrangement on the top of the circular plate;

[0013] A rotating assembly for rotating the circular plate, wherein the rotating assembly is mounted on the bottom plate;

[0014] A transmission component capable of utilizing the rotational force of the rotating component to operate the pulling component;

[0015] The pulling assembly comprises:

[0016] Brackets, a plurality of brackets are installed on the top of the circular plate in a circular arrangement;

[0017] An annular plate whose diameter can be changed, the annular plate being arranged between the plurality of brackets;

[0018] A first clamping assembly for fixing the polyimide film to be stretched, wherein the first clamping assembly is arranged on the annular plate;

[0019] The second clamping assembly is used for fixing the polyimide film during the stretching process, and the second clamping assembly is arranged on the annular plate.

[0020] As a preferred solution of the polyimide film bidirectional pulling device described in the present invention, the rotating assembly includes:

[0021] A box body, the box body is fixedly mounted on the top middle end of the bottom plate;

[0022] A servo motor, wherein the servo motor is fixedly mounted on the inner wall of the box;

[0023] The first rotating shaft is fixedly mounted on the output shaft of the servo motor, and a circular plate is fixedly mounted on the top of the first rotating shaft.

[0024] As a preferred solution of the polyimide film bidirectional pulling device described in the present invention, the transmission assembly includes:

[0025] A gear ring, a plurality of support rods are fixedly mounted on the bottom of the gear ring, and the support rods are fixedly mounted on the top of the bottom plate;

[0026] Second rotating shafts, the circular plate is arranged in a ring shape and rotatably connected to a plurality of second rotating shafts via bearings;

[0027] A pinion gear, the pinion gear is fixedly mounted on the second rotating shaft, and the pinion gear is meshingly connected with the ring gear;

[0028] The third rotating shafts are arranged in a ring on the circular plate and are rotatably connected to a plurality of third rotating shafts through bearings;

[0029] The large gear is fixedly mounted on the third rotating shaft and is meshedly connected with the small gear.

[0030] As a preferred solution of the polyimide film bidirectional pulling device described in the present invention, the pulling component includes:

[0031] A support plate, a third rotating shaft being fixedly mounted on the bottom of the support plate;

[0032] A column, wherein the column is fixedly mounted on the top of the support plate;

[0033] An I-shaped wheel, which is fixedly mounted on the column;

[0034] A nylon rope, one end of which is fixedly mounted on the spool, and the nylon rope is wound around the spool.

[0035] As a preferred solution of the polyimide film bidirectional pulling device described in the present invention, the pulling component further includes:

[0036] A transition assembly that enables the nylon rope to be arranged in a U-shape;

[0037] The transition component includes:

[0038] A first side plate, wherein a plurality of first side plates are fixedly mounted in a circular arrangement on the circular plate;

[0039] A first box body, wherein the first box body is fixedly mounted on a side wall of the first side plate;

[0040] A first electric push rod, which is fixedly mounted on the inner wall of the first box body;

[0041] A U-shaped plate, the output end of the first electric push rod is fixedly mounted with the U-shaped plate through a piston rod;

[0042] A fourth rotating shaft, the fourth rotating shaft being rotatably connected in the U-shaped plate via a bearing;

[0043] The track wheel is fixedly mounted on the fourth rotating shaft, and one side of the track wheel is in contact with the nylon rope.

[0044] As a preferred solution of the polyimide film bidirectional pulling device described in the present invention, the bracket includes:

[0045] A second side plate, a plurality of second side plates are fixedly mounted in a circular arrangement on the circular plate;

[0046] A through hole, wherein the through hole is opened in the second side plate;

[0047] Balls, a plurality of balls are arranged in a ring shape in the second side plate, the balls can roll in the second side plate, and one end of the balls is located in the through hole;

[0048] A slide bar, wherein the slide bar is located between the plurality of balls, and a nylon rope is fixedly installed at one end of the slide bar;

[0049] The spring is sleeved on the slide rod, and two ends of the spring are respectively fixedly connected to the second side plate and the annular plate.

[0050] As a preferred solution of a polyimide film bidirectional pulling device described in the present invention, the annular plate is composed of a plurality of first arc plates and a plurality of second arc plates, and both ends of one side of the first arc plate are connected to two groups of second arc plates through a connecting component, and the opposite ends of the two groups of second arc plates are in contact, and a group of sliding rods are fixedly installed on the other side of each group of the first arc plates.

[0051] As a preferred solution of the polyimide film bidirectional pulling device described in the present invention, the connecting component includes:

[0052] Guide rails, guide rails are fixedly mounted on both ends of one side of the first arc-shaped plate;

[0053] A guide groove is provided on one side of the second arc-shaped plate, and a guide rail is slidably connected in the guide groove.

[0054] As a preferred solution of the polyimide film bidirectional pulling device described in the present invention, the first clamping assembly includes:

[0055] A second fixing plate, on which both ends of the other side of the second arc-shaped plate are fixedly mounted;

[0056] A third box body, the third box body is fixedly mounted on the second fixing plate;

[0057] A third electric push rod, the third electric push rod is fixedly mounted on the inner wall of the third box body;

[0058] The second clamping plate is fixedly mounted on the output end of the third electric push rod via a piston rod.

[0059] As a preferred solution of the polyimide film bidirectional pulling device described in the present invention, the second clamping assembly includes:

[0060] A first fixing plate, wherein both ends of one side of the first arc-shaped plate are fixedly mounted with the first fixing plate;

[0061] A second box body, the second box body is fixedly mounted on the first fixing plate;

[0062] A second electric push rod, the second electric push rod is fixedly installed in the second box body;

[0063] A first clamping plate, the output end of the second electric push rod is fixedly mounted with the first clamping plate through a piston rod.

[0064] Compared with existing technologies:

[0065] 1. By setting up a pulling component, the polyimide film can be fully stretched. By fully stretching the polyimide film, the unstretched position can be greatly reduced, and the stretching quality is improved to a certain extent. In addition, the setting of the pulling component can not only make the polyimide film in a suspended state to avoid wear on the surface of the polyimide film, but also can stretch polyimide films of various diameters.

[0066] 2. By providing a rotating component for rotating the circular plate, and by providing a transmission component that can utilize the rotational force of the rotating component to operate the pulling component, it is possible to achieve the effect of operating several pulling components with only one set of motors, which can not only reduce the number of motors invested and save costs, but also ensure that several pulling components can operate synchronously.

[0067] 3. By providing a transmission component that can utilize the rotational force of the rotating component to operate the pulling component and by providing a transition component that can arrange the nylon rope in a U shape, it is possible to achieve that when the servo motor rotates rapidly, the sliding rod only moves a short distance, thereby enabling the second arc plates to slowly unfold, thereby enabling the stretching distance of the polyimide film to be accurately controlled. In addition, when the servo motor rotates rapidly, the polyimide film can be caused to perform a corresponding rapid rotation through the circular plate, thereby further avoiding the contact between the polyimide film and the circular plate under the action of centrifugation. BRIEF DESCRIPTION OF THE DRAWINGS

[0068] Figure 1 It is a front view schematic diagram of the structure of the present invention;

[0069] Figure 2 It is a schematic front view of a local structure of the present invention;

[0070] Figure 3 For the present invention Figure 2 A schematic diagram of the structure enlargement in the middle;

[0071] Figure 4 It is a top view schematic diagram of the transmission assembly of the present invention;

[0072] Figure 5 It is a top view schematic diagram of the circular plate of the present invention;

[0073] Figure 6 For the present invention Figure 5 A magnified schematic diagram of the structure at B in the middle;

[0074] Figure 7 It is a top view schematic diagram of the annular plate of the present invention;

[0075] Figure 8 It is a cross-sectional schematic diagram of the transition assembly of the present invention;

[0076] Fig. 9 This is a schematic diagram of the first curved plate structure of the present invention;

[0077] Fig.10 This is a schematic diagram of the second curved plate structure of the present invention.

[0078] In the figure: bottom plate 10, circular plate 20, rotating assembly 30, box body 31, servo motor 32, first rotating shaft 33, transmission assembly 40, gear ring 41, second rotating shaft 42, pinion 43, third rotating shaft 44, large gear 45, support rod 46, pulling assembly 50, supporting plate 51, column 52, I-shaped wheel 53, nylon rope 54, transition assembly 60, first side plate 61, first box body 62, first electric push rod 63, U-shaped plate 64, fourth rotating shaft 65, track wheel 66, pulling assembly 70, second side plate 71, through hole 72, ball 73, sliding rod 74, spring 75, first arc plate 81, second arc plate 82, guide rail 83, guide groove 84, first fixed plate 91, second box body 92, second electric push rod 93, first clamping plate 94, second fixed plate 96, third box body 97, third electric push rod 98, second clamping plate 99. DETAILED DESCRIPTION

[0079] In order to make the objectives, technical solutions and advantages of the present invention more clear, the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings.

[0080] The present invention provides a bidirectional pulling device for polyimide film, please refer to Figure 1-Figure 10 , comprising a base plate 10 and a circular plate 20;

[0081] It also includes: a rotating assembly 30 for rotating the circular plate 20, and the rotating assembly 30 is installed on the bottom plate 10;

[0082] The rotating assembly 30 includes: a box 31, a servo motor 32, and a first rotating shaft 33;

[0083] The box body 31 is fixedly mounted on the top middle end of the bottom plate 10 , the servo motor 32 is fixedly mounted on the inner wall of the box body 31 , the output shaft of the servo motor 32 is fixedly mounted on the first rotating shaft 33 , and the top of the first rotating shaft 33 is fixedly mounted on the circular plate 20 .

[0084] It also includes: a transmission assembly 40 capable of utilizing the rotational force of the rotating assembly 30 to operate the pulling assembly 50;

[0085] The transmission assembly 40 includes: a ring gear 41, a second rotating shaft 42, a small gear 43, a third rotating shaft 44, a large gear 45, and a support rod 46;

[0086] A plurality of support rods 46 are fixedly installed at the bottom of the gear ring 41, and the support rods 46 are fixedly installed on the top of the base plate 10. A plurality of second rotating shafts 42 are arranged in a ring on the circular plate 20 and are rotatably connected via bearings. A pinion 43 is fixedly installed on the second rotating shaft 42, and the pinion 43 is meshedly connected with the gear ring 41. A plurality of third rotating shafts 44 are arranged in a ring on the circular plate 20 and are rotatably connected via bearings. A large gear 45 is fixedly installed on the third rotating shaft 44.

[0087] It also includes: a pulling assembly 50 for expanding the pulling assembly, and a plurality of pulling assemblies 50 are installed in a circular arrangement on the top of the circular plate 20;

[0088] The pulling assembly 50 includes: a support plate 51, a column 52, an I-shaped wheel 53, and a nylon rope 54;

[0089] The third rotating shaft 44 is fixedly mounted on the bottom of the support plate 51 , the column 52 is fixedly mounted on the top of the support plate 51 , the I-shaped wheel 53 is fixedly mounted on the column 52 , one end of the nylon rope 54 is fixedly mounted on the I-shaped wheel 53 , and the nylon rope 54 is wound around the I-shaped wheel 53 .

[0090] The pulling assembly 50 further includes: a transition assembly 60 capable of arranging the nylon rope 54 in a U-shape;

[0091] The transition assembly 60 includes: a first side plate 61, a first box body 62, a first electric push rod 63, a U-shaped plate 64, a fourth rotating shaft 65, and a track wheel 66;

[0092] A plurality of first side plates 61 are fixedly installed in a circular arrangement on the circular plate 20, the first box body 62 is fixedly installed on the side wall of the first side plate 61, the first electric push rod 63 is fixedly installed on the inner wall of the first box body 62, the output end of the first electric push rod 63 is fixedly installed on the U-shaped plate 64 through a piston rod, the fourth rotating shaft 65 is rotatably connected in the U-shaped plate 64 through a bearing, and the track wheel 66 is fixedly installed on the fourth rotating shaft 65, and one side of the track wheel 66 is in contact with the nylon rope 54.

[0093] It also includes: a pulling assembly for fully stretching the polyimide film, and the pulling assembly is arranged on the top of the circular plate 20;

[0094] The pulling assembly includes: a bracket, an annular plate whose diameter can be changed, a first clamping assembly for fixing the polyimide film to be stretched, and a second clamping assembly for fixing the polyimide film during the stretching process;

[0095] The top of the circular plate 20 is provided with a plurality of brackets arranged in a ring shape, the ring plate is provided between the plurality of brackets, the first clamping assembly is provided on the ring plate, and the second clamping assembly is provided on the ring plate.

[0096] The bracket includes: a second side plate 71, a through hole 72, a ball 73, a slide rod 74, and a spring 75;

[0097] A plurality of second side plates 71 are fixedly installed in a circular arrangement on the circular plate 20, through holes 72 are opened in the second side plates 71, and a plurality of ball bearings 73 are arranged in a circular arrangement in the second side plates 71. The ball bearings 73 can roll in the second side plates 71, and one end of the ball bearings 73 is located in the through hole 72, and the slide bar 74 is located between the plurality of ball bearings 73. The arrangement of the ball bearings 73 facilitates the movement of the slide bar 74 in the through hole 72, and a nylon rope 54 is fixedly installed at one end of the slide bar 74, a spring 75 is sleeved on the slide bar 74, and both ends of the spring 75 are fixedly connected to the second side plate 71 and the circular plate, respectively.

[0098] The annular plate is composed of a plurality of first arc plates 81 and a plurality of second arc plates 82, and both ends of one side of the first arc plate 81 are connected to two groups of second arc plates 82 through connecting components, and the opposite ends of the two groups of second arc plates 82 are in contact, and a group of sliding rods 74 are fixedly installed on the other side of each group of first arc plates 81. The second arc plates 82 are preferably steel sheets, and their thickness can be set according to requirements. In the initial state, the plurality of second arc plates 82 form a smaller annular plate, and the connection between the two groups of second arc plates 82 is located in the middle of one side of the first arc plate 81.

[0099] The connecting assembly includes: a guide rail 83 and a guide groove 84;

[0100] Guide rails 83 are fixedly installed at both ends of one side of the first arc plate 81, and a guide groove 84 is opened on one side of the second arc plate 82, and the guide rail 83 is slidably connected in the guide groove 84. The cross-sections of the guide rail 83 and the guide groove 84 are set to be T-shaped, and the two ends of the guide groove 84 can be sealed as needed to avoid separation of the first arc plate 81 and the second arc plate 82.

[0101] The first clamping assembly includes: a second fixing plate 96, a third box body 97, a third electric push rod 98, and a second clamping plate 99;

[0102] The second fixed plates 96 are fixedly installed at both ends of the other side of the second arc plate 82, the third box body 97 is fixedly installed on the second fixed plate 96, the third electric push rod 98 is fixedly installed on the inner wall of the third box body 97, and the output end of the third electric push rod 98 is fixedly installed with a second clamping plate 99 through a piston rod, and the shape of the second clamping plate 99 is set to be arc-shaped, wherein a plurality of second clamping plates 99 form a smaller annular plate.

[0103] The second clamping assembly includes: a first fixing plate 91, a second box body 92, a second electric push rod 93, and a first clamping plate 94;

[0104] The first fixed plate 91 is fixedly installed at both ends of one side of the first arc plate 81, the second box body 92 is fixedly installed on the first fixed plate 91, the second electric push rod 93 is fixedly installed in the second box body 92, and the output end of the second electric push rod 93 is fixedly installed with a first clamping plate 94 through a piston rod, and the shape of the first clamping plate 94 is set to be arc-shaped.

[0105] Working principle:

[0106] Step 1: Place the edge of the polyimide film to be stretched between the two sets of second clamping plates 99. At this time, the two sets of second clamping plates 99 are moved toward each other by the third electric push rod 98 until the two sets of second clamping plates 99 clamp and fix the edge of the polyimide film;

[0107] Step 2: The first rotating shaft 33 is rotated by the servo motor 32. When the first rotating shaft 33 rotates, the circular plate 20 is driven to rotate;

[0108] Step 3: When the circular plate 20 rotates, the pinion 43 will revolve along the gear ring 41, so that the pinion 43 can rotate on its own. When the pinion 43 rotates on its own, it will drive the large gear 45 to rotate, and then the third rotating shaft 44 can rotate. By setting the pinion 43 and the large gear 45, it is possible to achieve that when the pinion 43 rotates one circle, the large gear 45 cannot rotate one circle. The diameter ratio of the pinion 43 and the large gear 45 can be set according to the needs, so that when the pinion 43 rotates one circle, the large gear 45 only rotates a small angle;

[0109] Step 4: When the third rotating shaft 44 rotates, the spool wheel 53 is driven to rotate, and when the spool wheel 53 rotates, the nylon rope 54 is wound around it, so that the nylon rope 54 can pull the slide bar 74 to move toward the spool wheel 53;

[0110] Step 5: When the nylon rope 54 is being wound, the track wheel 66 is moved toward the I-shaped wheel 53 by the first electric push rod 63, so that a portion of the nylon rope 54 can be wound by the I-shaped wheel 53, so that when the I-shaped wheel 53 winds the nylon rope 54 once, the slide bar 74 only moves a short distance;

[0111] Step 6: When the slide bar 74 moves, its spring 75 will be deformed. At the same time, the moving slide bar 74 will drive the first arc plate 81 to move toward the second side plate 71. When the first arc plate 81 moves toward the second side plate 71, a plurality of second arc plates 82 will be gradually unfolded, and the polyimide film will be stretched at this time.

[0112] Step 7: When the polyimide film is stretched to a certain extent (i.e., the length of the first clamping plate 94 is the same as the length between the two groups of second arc-shaped plates 82), the two groups of first clamping plates 94 are moved toward each other by the second electric push rod 93 until the two groups of first clamping plates 94 clamp and fix the excess edge of the polyimide film and continue to stretch it, so that the polyimide film can be fully stretched.

[0113] Although the present invention has been described above with reference to the embodiments, various modifications may be made thereto and parts thereof may be replaced by equivalents without departing from the scope of the present invention. In particular, as long as there is no structural conflict, the various features in the embodiments disclosed in the present invention may be used in combination with each other in any manner, and the fact that these combinations are not exhaustively described in this specification is only for the sake of omitting space and saving resources. Therefore, the present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A polyimide film bidirectional pulling device, comprising a bottom plate (10) and a circular plate (20), It is characterized in that Also includes: A pulling assembly for fully stretching the polyimide film, wherein the pulling assembly is arranged on the top of the circular plate (20); A pulling assembly (50) for unfolding the pulling assembly, and a plurality of pulling assemblies (50) are installed in a circular arrangement on the top of the circular plate (20); A rotating assembly (30) for rotating the circular plate (20), wherein the rotating assembly (30) is mounted on the bottom plate (10); A transmission assembly (40) capable of utilizing the rotational force of the rotating assembly (30) to operate the pulling assembly (50); The pulling assembly comprises: Brackets, a plurality of brackets are installed in a circular arrangement on the top of the circular plate (20); An annular plate whose diameter can be changed, the annular plate being arranged between the plurality of brackets; A first clamping assembly for fixing the polyimide film to be stretched, wherein the first clamping assembly is arranged on the annular plate; The second clamping assembly is used for fixing the polyimide film during the stretching process, and the second clamping assembly is arranged on the annular plate.

2. A polyimide film bidirectional pulling device according to claim 1, It is characterized in that The rotating assembly (30) comprises: A box body (31), wherein the box body (31) is fixedly mounted on the top middle end of the bottom plate (10); A servo motor (32), wherein the servo motor (32) is fixedly mounted on the inner wall of the box body (31); A first rotating shaft (33), the output shaft of the servo motor (32) is fixedly mounted on the first rotating shaft (33), and a circular plate (20) is fixedly mounted on the top of the first rotating shaft (33).

3. A polyimide film bidirectional pulling device according to claim 2, It is characterized in that The transmission assembly (40) comprises: A gear ring (41), wherein a plurality of support rods (46) are fixedly mounted on the bottom of the gear ring (41), and the support rods (46) are fixedly mounted on the top of the bottom plate (10); A plurality of second rotating shafts (42) are arranged in a ring shape on the circular plate (20) and are rotatably connected via bearings; A pinion gear (43), wherein the pinion gear (43) is fixedly mounted on the second rotating shaft (42), and the pinion gear (43) is meshingly connected with the ring gear (41); A plurality of third rotating shafts (44) are arranged in a ring shape on the circular plate (20) and are rotatably connected via bearings; A large gear (45) is fixedly mounted on the third rotating shaft (44), and the large gear (45) is meshingly connected with the small gear (43).

4. A polyimide film bidirectional pulling device according to claim 1, It is characterized in that The pulling assembly (50) comprises: A support plate (51), a third rotating shaft (44) being fixedly mounted on the bottom of the support plate (51); A column (52), wherein the column (52) is fixedly mounted on the top of the support plate (51); An I-shaped wheel (53), wherein the I-shaped wheel (53) is fixedly mounted on the column (52); A nylon rope (54), one end of which is fixedly mounted on the spool wheel (53), and the nylon rope (54) is wound around the spool wheel (53).

5. A polyimide film bidirectional pulling device according to claim 4, It is characterized in that The pulling assembly (50) further comprises: A transition assembly (60) capable of arranging the nylon rope (54) in a U-shape; The transition assembly (60) comprises: A first side plate (61), a plurality of first side plates (61) are fixedly mounted on the circular plate (20) in an annular arrangement; A first box body (62), wherein the first box body (62) is fixedly mounted on a side wall of the first side plate (61); A first electric push rod (63), the first electric push rod (63) is fixedly mounted on the inner wall of the first box body (62); A U-shaped plate (64), the output end of the first electric push rod (63) is fixedly mounted with the U-shaped plate (64) via a piston rod; a fourth rotating shaft (65), the fourth rotating shaft (65) being rotatably connected to the U-shaped plate (64) via a bearing; A track wheel (66), wherein the track wheel (66) is fixedly mounted on the fourth rotating shaft (65), and one side of the track wheel (66) is in contact with the nylon rope (54).

6. A polyimide film bidirectional pulling device according to claim 1, It is characterized in that The support comprises: Second side plates (71), a plurality of second side plates (71) are fixedly mounted on the circular plate (20) in an annular arrangement; A through hole (72), wherein the through hole (72) is opened in the second side plate (71); Balls (73), a plurality of balls (73) are arranged in a ring shape in the second side plate (71), the balls (73) can roll in the second side plate (71), and one end of the balls (73) is located in the through hole (72); A slide bar (74), wherein the slide bar (74) is located between the plurality of balls (73), and a nylon rope (54) is fixedly mounted on one end of the slide bar (74); A spring (75) is sleeved on the slide bar (74), and two ends of the spring (75) are respectively fixedly connected to the second side plate (71) and the annular plate.

7. A polyimide film bidirectional pulling device according to claim 1, It is characterized in that The annular plate is composed of a plurality of first arc-shaped plates (81) and a plurality of second arc-shaped plates (82), and both ends of one side of the first arc-shaped plate (81) are connected to two groups of second arc-shaped plates (82) through a connecting assembly, and the opposite ends of the two groups of second arc-shaped plates (82) are in contact with each other, and a group of sliding rods (74) are fixedly installed on the other side of each group of the first arc-shaped plates (81).

8. A polyimide film bidirectional pulling device according to claim 7, It is characterized in that The connection component comprises: A guide rail (83), the guide rails (83) being fixedly mounted on both ends of one side of the first arc-shaped plate (81); A guide groove (84) is provided on one side of the second arc-shaped plate (82), and a guide rail (83) is slidably connected in the guide groove (84).

9. A polyimide film bidirectional pulling device according to claim 7, It is characterized in that The first clamping assembly comprises: A second fixing plate (96), the second fixing plates (96) being fixedly mounted on both ends of the other side of the second arc-shaped plate (82); A third box body (97), wherein the third box body (97) is fixedly mounted on the second fixing plate (96); A third electric push rod (98), wherein the third electric push rod (98) is fixedly mounted on the inner wall of the third box body (97); A second clamping plate (99), the output end of the third electric push rod (98) is fixedly mounted on the second clamping plate (99) via a piston rod.

10. A polyimide film bidirectional pulling device according to claim 7, It is characterized in that The second clamping assembly comprises: A first fixing plate (91), the first fixing plate (91) being fixedly mounted on both ends of one side of the first arc-shaped plate (81); A second box body (92), wherein the second box body (92) is fixedly mounted on the first fixing plate (91); A second electric push rod (93), wherein the second electric push rod (93) is fixedly installed in the second box body (92); A first clamping plate (94), the output end of the second electric push rod (93) is fixedly mounted with the first clamping plate (94) via a piston rod.

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